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Lithium carbide, Li2C2, often known as dilithium acetylide, is a chemical compound of lithium and carbon. It is an intermediate compound produced during radiocarbon dating procedures. Li2C2 is one of an extensive range of lithium− carbon compounds which include the lithium rich; Li4C, Li6C2, Li8C3, Li6C3, Li4C3, Li4C5, and the graphite intercalation compounds LiC6, LiC12, and LiC18.
Additional recommended knowledge
Preparation and chemistry
To prepare pure samples in the laboratory molten lithium + graphite are reacted at high temperature. Li2C2 can also be prepared by reacting CO2 with molten lithium. It is reactive and hydrolyses very readily to form acetylene gas , C2H2, and LiOH.
Li2C2 is an ionic salt and is formulated 2Li+ C22−. It has a similar structure to Rb2O2 and Cs2O2. At high temperatures Li2C2 transforms reversibly to a cubic anti-fluorite structure.
Use in radiocarbon dating
There are a number of procedures employed, some that burn the sample producing CO2 prior that is then reacted with lithium, and others where the carbon containing sample is reacted directly with lithium metal.. The outcome is the same, Li2C2 is produced. Note that lithium nitride may be formed and this produces ammonia when hydrolysed, which contaminates the acetylene gas.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lithium_carbide". A list of authors is available in Wikipedia.|